I'm trying to get a ladie's IH tractor going so she can cut her grass herself, and I need the head bolt torque to continue. It uses a Kohler K241A 10HP engine, and I had to pull the head to free up the exhaust valve. I got it freed up, and temporarily re-installed the old head gasket, and it started and ran good. Now I've got to replace the head gasket and torque it properly. How tight? Are there multiple steps?